The Cosmos is all that is or was or ever will be. Our feeblest contemplations of the Cosmos stir us -- there is a tingling in the spine, a catch in the voice, a faint sensation, as if a distant memory, of falling from a height. We know we are approaching the greatest of mysteries.

In Dr Wetterich’s picture of the cosmos the redshift others attribute to expansion is, rather, the result of the universe putting on weight. If atoms weighed less in the past, he reasons, the light they emitted then would, in keeping with the laws of quantum mechanics, have been less energetic than the light they emit now.